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Topic: Instantaneous stability


In the News (Sat 30 Aug 08)

  
  Stability - Wikipedia, the free encyclopedia
Instantaneous stability, or intact stability, a measure of how a vessel's buoyancy is distributed
Directional stability, or the tendency for a body moving with respect to a medium to point in the direction of motion.
Stable polynomial, a polynomial whose roots all lie in the open left half-plane or whose roots all lie in the open unit disk
en.wikipedia.org /wiki/Stability   (276 words)

  
 Basics of Design Engineering - Electrical/Electronic - Power Supplies - Specifications
Instantaneous output voltage is affected by the ripple present.
Power-supply stability is the percent change of output voltage as a function of time.
A stability figure is often stated for warm-up, based on a short time period, typically 20 min, as well as for long term, typically a 24-hr period.
www.machinedesign.com /BDE/Electrical/bdeee7/bdeee7_2.html   (1246 words)

  
 Instantaneous control
Instantaneous control computes an approximation to the next optimal move by applying exactly one step of the gradient method to the solution of the instantaneous control problem and applies the approximate control to advance to the next time slice.
In its nature instantaneous control is a discrete-in-time feedback control approach and, as shall be shown, can be interpreted as the stable time discretization of a closed-loop control law [12].
Instantaneous control is applied to the control of the Burgers equation in [16].
www.kfunigraz.ac.at /imawww/invcon/instcont.html   (679 words)

  
 UF High Speed Machining FAQ
In general, stability lobe diagrams are developed by selecting the cutting parameters, which include the process-dependent specific cutting energy coefficients, radial immersion, and system dynamics (often selected as the tool point frequency response, although the workpiece dynamics must also be considered in some instances), then carrying out the selected simulation algorithm.
In the stability lobe diagram shown in Figure 3, the peaks of the stable regions where deeper cuts are possible (i.e., where the ‘good cut’ is identified) correspond to this favorable ‘in phase’ condition.
A stability lobe diagram is a plot that separates unstable combinations of chip width, or axial depth of cut in peripheral end milling, and spindle speed (i.e., those that produce chatter) from stable combinations.
highspeedmachining.mae.ufl.edu /htmlsite/faq.html   (3412 words)

  
 Naval architecture
Instantaneous stability is a measure of how the vessel's buoyancy is distributed.
Ultimate stability is concerned with where the vessel's center of gravity has been located.
Damaged stability gives an indication of the ability of the ship to survive a collision, grounding, of explosion in which the hull is breached and water enters 1 or more compartments of the ship.
www.designaids.com /engineering/Naval_architecture.html   (2119 words)

  
 Blind Source Separation
Stability is analyzed for instantaneous mixtures and an example of tap weight convergence is shown for both instantaneous and convolutive mixtures.
The stability criterion is difficult to determine for the general case, but it is simple if the mixture is instantaneous and the observations are identically zero after a finite number of samples.
For both the instantaneous mixture and the convolutive mixture, the symmetric adaptive decorrelator was able to find a solution close to the optimal.
www.cnel.ufl.edu /info/bss.html   (3935 words)

  
 [No title]   (Site not responding. Last check: 2007-10-25)
Title: On the Stability and Instantaneous Velocity of Grasped Frictionless Objects Summary: The author has two main contributions: 1) The author proposes a metric for force-closure (Note 1) which is the minimum positive value of the internal force vector.
The author then defines a stable equlibrium of configuration of a fixed finger position grasp as the local minima of a gravitational potential energy field (Note 2).
A restatement of this is that the system will instantaneously move in the direction in which it "fights" the external force the least, subject to the constraints.
www.cs.cmu.edu /afs/cs.cmu.edu/user/algaei/www/Comments/Grasping/Trinkle1.txt   (402 words)

  
 Statement from the Rt Hon Gordon Brown MP to the IMFC on Sunday 29 April 2001
So we meet here as countries determined to steer a course of stability and sustained growth; and at a time of slowing world economic growth, this is a moment not for retreating from global economic cooperation or losing faith in its efficacy and turning inwards, but a time for enhanced global cooperation.
But this responsibility to participate in maintaining a stable financial system also demands new actions and commitments from national governments and from the official sector as a whole to establish the presumption of private sector involvement in a fair and predictable manner.
The responsibility of private investors to share fairly the burden with the official sector should be matched by the right to expect fair and consistent treatment by the official sector in times of crisis, and to be kept informed by national governments and through reliable, transparent and comprehensive surveillance from the IMF.
www.imf.org /external/spring/2001/imfc/gbr.htm   (3363 words)

  
 Section One
The "frequency stability" of an oscillator is a term used to characterize how small the frequency fluctuations are of the oscillator signal.
One goal is to measure the frequency and/or the frequency stability of the sinusoid.
It is only important to know k if the absolute time difference is desired; for frequency and frequency stability measurements and for time fluctuation measurements, k may be assumed zero unless one goes through a cycle during a set of measurements.
www.tf.nist.gov /timefreq/phase/Properties/one.htm   (3171 words)

  
 Vestibular Contributions to Gaze Stability During Transient Forward and Backward Motion -- Hess and Angelaki 90 (3): ...
To quantify the efficacy of the vestibular-driven instantaneous
Instantaneous velocity gains and directional errors as a function of heading direction at different times after motion onset during forward motion (A) and backward motion (B).
Instantaneous velocity gains and directional errors as a function of time after motion onset.
jn.physiology.org /cgi/content/full/90/3/1996   (5604 words)

  
 CEE - Faculty and Staff
The stability and deformation of Waba Dam following new seismic requirements is evaluated using the prevailing methods of pseudo-static analysis and dynamic non-linear analyses.
To assess stability, the instantaneous safety factor was calculated based on the conventional and a proposed method considering dynamic forces.
While the dam is considered problematic from the pseudo static analysis, it is acceptable based on the dynamic analysis.
www.civeng.carleton.ca /Faculty/Bio_Student.php3?Student=735   (180 words)

  
 Role of Feedforward Control of Movement Stability in Reducing Slip-Related Balance Loss and Falls Among Older Adults -- ...
A schematic definition of the stability measure inside of the feasible stability region (open region) that separates the forward ("Forward LOB-S", shaded in gray) and the backward ("Backward LOB-S", shaded in gray) balance loss regions mathematically derived for slip conditions in the center of mass (COM) state space.
Stability at seat-off is measured by the shortest inwardly directed distance (d) to the COM state at seat-off (at location s with triangle) from the backward loss of balance boundary of the feasible stability region.
Larger values of predicted stability in (a) and (b) are interpreted as increased stability against backward balance loss and decreased stability against forward balance loss.
jn.physiology.org /cgi/content/full/90/2/755   (6068 words)

  
 Molecular Dynamics Simulation of the Human U2B" Protein Complex with U2 snRNA Hairpin IV in Aqueous Solution -- Guo and ...   (Site not responding. Last check: 2007-10-25)
The structure of this bridging water molecule was remarkably stable during the trajectory.
Defining the number of water molecules that reside at the RNA/protein interface is difficult because this number is time-dependent.
Continuum solvent studies of the stability of DNA, RNA, and phosphoramidate-DNA helices.
www.biophysj.org /cgi/content/full/81/2/630   (5603 words)

  
 Nonlinear Stability Analysis for a Class of TCP/AQM Networks
By proportional feedback we mean the marking probability is proportional to the instantaneous queue length.
In this work we address these non-linearities directly and establish some stability results when the marking is proportional.
In the case of delay-free marking, we show the systems equilibrium point to be asymptotically stable for all proportional gains.
www.ecs.umass.edu /mie/labs/dacs/nonlinear_stability.htm   (155 words)

  
 [No title]
Stability of scalar delay differential equations with dominant delayed terms (with X. Tang), Proc.
Stable periodic solutions in a discrete periodic logistic equation (with Z. Zhou), Appl.Math.
Stability in linear delay systems without instantaneous negative feedbacks (with J. So and X. Tang), SIAM J Math.
www.cs.mun.ca /~xzou/pub.html   (763 words)

  
 America's Rabbi | Judeo-Christianity Girds America
This instantaneous greatness bespoke a founding ethos, something concrete, not something haphazardly evolved.
No, the uniqueness and stability which is America lies necessarily in a protean philosophy precipitant to such a model and outcome, i.e., a wellspring precisely suited to deliver those national aspects by which America is known and which provides its success.
Though sourced in religion and Scripture, the importance for society of Judeo-Christianity lay in its spawning of cultural norms, so that already by the time of Benjamin Franklin's writings, the Calvinist religious ideals of frugality, hard work, and thrift were conspicuous societal attributes, even among those not attending services.
www.caucusforamerica.com /print.php?pID=232   (1909 words)

  
 Instantaneous Discs
Created using a special turntable either acoustically or magnetically, instantaneous discs created immediately available recordings that were unique, consumer-initiated sonic time capsules of a period in which media innovations were broadening and linking the world in a way quite similar to present day computer technology and the internet.
Although it is arguable that instantaneous disc recordings were available throughout the advancing material history of the sound recording disc, it seems that the specific manufacture of instantaneous discs and the devices on which to record these discs for wide-spread use begins in 1934 with the cellulose nitrate laminate disc.
Cellulose nitrate, while certainly not a champion of stability, is however much more durable and has better playback sound quality than its soft wax or ethyl cellulose counterparts, which may be part of the reason that instantaneous discs are widely understood to be composed of only that material.
www.gslis.utexas.edu /~hollyr/portfolio/projects/instadiscs/patent.html   (1152 words)

  
 gggggg
[25] K. Liu and X. Xia, On the exponential stability in the mean square of neutral stochastic differential functional equations.
Edinburgh, A. Liu, On stability for a class of semilinear stochastic evolution equations.
[33] K. Liu, Stability with a general rate function for a class of stochastic evolution equations in infinite dimensional spaces.
pcwww.liv.ac.uk /~kliu/publications.htm   (680 words)

  
 Hydraulic working oil composition - Patent 5902777
The hydraulic working oil composiiton according to the present invention is excellent in oxidation stability and lubricating performance under high pressure, and is suitably used in hydraulic machinery and equipment that are operated at a working pressure of 30 MPa or higher.
Then an evalutation was made of the heat stability under high pressure of the working oil by measuring the amount of the sludge (millipore value) in the oil which had been formed during 720 hours.
The performance results in Example 2 and 3 demonstrate that although the use of either of the fatty acid amide and the polyhydric alcohol ester exhibits good result with regard to the cylinder waviness characteristics, the combinational use of the both is furthermore effective from the overall viewpoint.
www.freepatentsonline.com /5902777.html   (2856 words)

  
 glossary
Plants produced by a genetic engineering technique by which single cells or protoplasts are cultured to produce individuals which are genetically variable from their genetically stable parent.
An important element in the understanding of biological control is therefore to identify the factors that may be responsible for this stability.
Referring to the use of meteorological data obtained simultaneously over a wide area for the purpose of presenting a comprehensive and nearly instantaneous picture of the state of the atmosphere.
www.pestmanagement.co.uk /lib/glossary/glossary_s.shtml   (10157 words)

  
 CiteULike: A search model of marriage and divorce   (Site not responding. Last check: 2007-10-25)
A relationship is stable for one partner if there is less chance that the other will leave.
Since both partners are making these evaluations, the stability of the relationship for one companion depends on the stability of the relationship for the other and as such, separations rates are endogenous.
It is shown that these feedback effects in search strategies generate a new type of multiple equilibria which is either stable or unstable depending on individuals' beliefs.
www.citeulike.org /user/mhinnosaar/article/452932   (322 words)

  
 ATSDR - PHA - Lawrence Livermore National Laboratory, Main Site (USDOE), Livermore, Alameda County, California
During the time of the accident, the wind was from the southwest (~200º) at a speed of 1-2 m/sec (2.2-4.5 mph) with stable to very stable atmospheric conditions (Pasquill-Turner Stability Classes E or F).
The instantaneous air concentrations (Table A-3), which are used to estimate direct HT inhalation doses, are derived from the instantaneous deposition rates by dividing by the RASCAL default deposition velocity.
Cumulative HT concentrations (Tables A-4 and A-5), which are used to estimate HT deposition, are obtained by dividing the cumulative surface concentrations by the default deposition velocity.
www.atsdr.cdc.gov /HAC/PHA/livermore4/lms_p5.html   (6541 words)

  
 Tweaking the Mark XII: Part 2.1 - TimeZone
SRSP is a measure of the (relatively) instantaneous stability of rate, with no regard to a time standard.
Without good stability over time and between positions, absolute rate is a moot point because it cannot be reliably accomplished.
With good stability over time and between positions, absolute rate is a simple matter of adjusting the effective length of the balance spring with the regulator (or, in the case of adjustable mass balances, the center of mass of the balance).
www.timezone.com /library/horologium/horologium0037   (2087 words)

  
 Pop Ecol Lect 04 16-Jan
One way of assessing the stability of a system is to conduct perturbation experiments.
In that case, the population will tend to stay where it is. This is neutral stability -- if the population size changes (say through a factor we are currently ignoring such as immigration) there will not be a tendency to return to the starting point.
With more complicated and realistic equations, stability analysis can become more technically challenging, but the basic logic is the same.
www.uwyo.edu /dbmcd/popecol/janlects/lect04.html   (2855 words)

  
 IE Technics Group - Products / Protection Devices   (Site not responding. Last check: 2007-10-25)
This unit is designed to automatically protect your fridges, deep-freezers and air-conditioners from voltage fluctuations and instantaneous power interruptions.
This unit is designed to stabilize and protect your fridges, deep-freezers and air-conditioners from voltage fluctuations and instantaneous power interruptions.
This unit is specially designed to stabilize and protect your photocopiers and other electronic equipment from damages caused by voltage fluctuations and instantaneous power interruptions.
www.ie.lk /products/pd.htm   (226 words)

  
 Math Finance Seminar : Abstract
A hedged Stochastic calculus of variations is introduced where the reduced length of the variation propagate according a linear ODE, defining the instantaneous rate of liquidity.
In a model free situation, an approach to get the instantaneous rate of liquidity is proposed through measurements of iterated volatilities.
In the multivariate case the instantaneous rate has to be generalized in an elasticity matrix describing the direction of internal stability of the market for the risk free process.
www.math.nyu.edu /faculty/avellane/pmalliavin.html   (189 words)

  
 AutoNav Marine Systems Inc. - Autopilots - Compasses
Conventional flux gate compasses lack this stability forcing manufacturers to use excessive electronic damping which slows autopilot response to course errors resulting in the user turning the pilot off in heavy weather...just when it is needed the most.
On large vessels, and frequently on steel vessels, it is preferred to use the vessels magnetic compass for the autopilot.
On large vessels, a gyro compass is often used to obtain the utmost in heading accuracy and stability.
www.autonav.com /html/anav4002.htm   (330 words)

  
 What Makes this Network Marketing Company Different?
This joint effort between these established companies provides the stability and infrastructure necessary to revolutionize the MLM industry.
This is the first time that a venture has been created with instantaneous stability, virtually unlimited resources for training, and most importantly, a marketing firm with TV advertising facilities and expertise already in place.
With nation wide seminars, conference calls, and conventions, and a massive national marketing campaign (including print, radio, and television) already in progress, this company is destined to grow at a phenomenal rate.
www.angelfire.com /az/NFLITMG/diff.html   (447 words)

  
 Hands for Dexterous Manipulation and Powerful Grasping: A Difficult Road Towards Simplicity (ResearchIndex)   (Site not responding. Last check: 2007-10-25)
38 the stability and instantaneous velocity of grasped friction..
11 Grasp stability and feasibility for an arm with an articulat..
2 Modeling and analysis of the compliance and stability of env..
citeseer.ist.psu.edu /3568.html   (2013 words)

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